package com.wwj.tem.utils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;

/**
 * @author: wwj
 * @create: 2024/7/24 - 22:05
 * Description: 网络工具类
 */
public class NetUtils {
	private NetUtils() {
	
	}
	/**
	 * 获取 IP 地址
	 * 获取客户端 IP 地址
	 *
	 * @param request 请求
	 * @return {@link String}
	 */
	public static String getIpAddress(HttpServletRequest request) {
		String ip = request.getHeader("x-forwarded-for");
		if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
			if ("127.0.0.1".equals(ip)) {
				// 根据网卡取本机配置的 IP
				InetAddress inet = null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (Exception e) {
					throw new IllegalStateException("Utility class");
				}
				if (inet != null) {
					ip = inet.getHostAddress();
				}
			}
		}
		// 多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ip != null && ip.length() > 15) {
			if (ip.indexOf(",") > 0) {
				ip = ip.substring(0, ip.indexOf(","));
			}
		}
		if (ip == null) {
			return "127.0.0.1";
		}
		return ip;
	}
	
}
